Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,062.9	$ 803.5	$ 2,088.3	$ 1,726.9
Segment EBIT:
Segment EBITDA	208.5	165.1	419.1	347.7
Recognition of net actuarial losses (gains)	(3.5)	(8.8)	(4.4)	(8.8)
Depreciation and amortization	(42.2)	(41.7)	(85.2)	(84.0)
Interest expense	(15.3)	(18.9)	(30.2)	(36.0)
Interest income	0.7	0.6	1.2	2.1
Income before income taxes	136.6	89.8	277.9	203.4
Bargain purchase price gain	0.0	0.0	0.6	0.0
Mobile Industries
Segment Reporting Information [Line Items]
Net sales	494.2	342.6	998.7	809.3
Segment EBIT:
Segment EBITDA	67.3	38.8	146.9	113.9
Process Industries
Segment Reporting Information [Line Items]
Net sales	568.7	460.9	1,089.6	917.6
Segment EBIT:
Segment EBITDA	141.2	126.3	272.2	233.8
Corporate Segment
Segment EBIT:
Corporate EBITDA	$ (11.6)	$ (6.5)	$ (23.2)	$ (17.6)